When I lived in Madison, Wisconsin, one of the community activities that I found the most enjoyable was to help start NWEI discussion groups (on topics such as Voluntary Simplicity, Deep Ecology, Choices for Sustainable Living, a Sense of Place, etc).
Although the groups use an anthology of readings as background for the meetings, and a way of kicking off the conversation, I found that the magic happened in the interactions among the participants. It is amazing to see the wisdom and experience that is allowed to surface when we have a deep and personal dialogue, and the even richer and deeper wisdom that comes out of the group interaction.
It also became clearer to me how important it is to create a good container for quality interactions. Some of the guidelines: Speaking time is shared among participants, talking from personal experience (avoiding abstract ideas, blaming others, etc), solution focus, etc.